<template>
  <view>
    <!-- 搜索框组件-->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域-->
      <scroll-view class="left-scroll-view" scroll-y :style="{height:wh + 'px'}">
        <block v-for="(item,index) in cateList" :key="index">
             <view :class="['left-scroll-view-item',active==index?'active':'']"  @click="activeChanged(index)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧的滚动视图区域-->
      <scroll-view class="right-scroll-view" scroll-y :style="{height:wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,index2) in cateList2" :key="index2">
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <!-- 动态渲染三级分类数据-->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3" @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon.replace('dev','web')" ></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>

    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    //使用封装的设置tabBar的徽标
    mixins:[badgeMix],
    data() {
      return {
         wh:0, //当前设备可用高度
         active:0, //用于修改选中状态
         scrollTop:0,//一级菜单切换后需要重置滚动条
         cateList:[],//左侧一级数据
         cateList2:[],//右侧二级渲染数据
      };
    },
    onLoad() {
      //可以获取手机型号以及其信息
        const sysInfo = uni.getSystemInfoSync()
        //可用高度 = 屏幕高度 -navigationBar 高度 - tabBar高度 - 自定义组件search高度
        this.wh=sysInfo.windowHeight - 50
        this.getCateList()
    },
   
    methods: {
      //获取分类列表数据的方法
      async getCateList(){
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status==200){
          this.cateList = res.message
          //二级分类  默认展示第一项
          this.cateList2 = res.message[0].children
   
        }else{
          uni.$showMsg()
        }
      },
      // 点击更改active值
      activeChanged(index){
        this.active=index
        this.cateList2 =  this.cateList[index].children
        //切换一级分类  让右侧滚动条置顶
        //已经为0了 不能设置重复的值 否则不会生效
        this.scrollTop = this.scrollTop==0?1:0
      },
      //点击三级分类图片跳转
      gotoGoodsList(item3){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' +item3.cat_id
        })
      },
      //搜索框点击的自定义触发事件
      gotoSearch(){
        uni.navigateTo({ 
          url:'/subpkg/search/search'
        })
      },
    
    },
   
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .left-scroll-view{
    width: 120px;
    
    .left-scroll-view-item{
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      &.active{
        background-color: #fff;
        position: relative;
        
        &::before{
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
  .cate-lv2-title{
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item{
      width: 33.3%;
      display: flex;
      flex-direction: column;
      align-items: center;
      margin-bottom: 10px;
      image{
        width: 60px;
        height: 60px; 
      }
      text{
        margin-top: 5px;
        font-size: 12px;
      }
    }
  }
}
</style>
